Car shake

[nabzz]

Hi guys, so I own an a4 cabriolet 2006 s line... I changed the standard 18inch alloys to 19inch s5 style alloys.... Looks amazing but at speeds above 80mph the car shakes had it balanced twice still the same the guy at the alloy shop says it might be my bushes... He says the change in alloy size could be highlighting it... Could this be true... I don't get the shakes with the other alloys...

[neilos100]

If you go faster than 80 does it disappear? If so it does still sound like a tyre out of balance.....
Sent from my phone...

[zollaf]

very unlikely to be bushes. as above more than likely the new wheels not balanced properly. you say they have been done twice , by the same person ? if so, try someone else, maybe the balance machine needs calibrating.

[darich]

could be either a flat spot or one one of the wheels slightly out of true.

[warp_speed]

Hi guys, so I own an a4 cabriolet 2006 s line... I changed the standard 18inch alloys to 19inch s5 style alloys.... Looks amazing but at speeds above 80mph the car shakes had it balanced twice still the same the guy at the alloy shop says it might be my bushes... He says the change in alloy size could be highlighting it... Could this be true... I don't get the shakes with the other alloys...

Nabzz, you need to get centreless wheel balancing done. I think it states that in the Audi technical manuals that our cars can't be balanced properly on a cone type balance machine. I have been in this position many times and a guy I know only does centreless because "that's how the wheels are mounted on a car". Its a good point because I've never had a balance problem especially when on holidays in Germany. But always have problems using cone type balancing.

[nabzz]

Nabzz, you need to get centreless wheel balancing done. I think it states that in the Audi technical manuals that our cars can't be balanced properly on a cone type balance machine. I have been in this position many times and a guy I know only does centreless because "that's how the wheels are mounted on a car". Its a good point because I've never had a balance problem especially when on holidays in Germany. But always have problems using cone type balancing.
Warp_speed u r amazing I did not think off this... I'll get this done 2moro

[discobarry]

Out of interest warp_speed, How does everybody else get on with there B7 balancing if they don't use centreless balancing? I balance my own wheels for one with a normal balancer(which also does centreless) and never have any problems.

Maybe your guy just needs to calibrate his machine ;)

[warp_speed]

Out of interest warp_speed, How does everybody else get on with there B7 balancing if they don't use centreless balancing? I balance my own wheels for one with a normal balancer(which also does centreless) and never have any problems.

Maybe your guy just needs to calibrate his machine ;)

It's an excellent point, I asked my wheel balancing guy about this, who told me to ask other wheel balancing places that do centre mounted to run the machine with nothing on it. He was right, they tell me to f off and say its calibrated.

Of course there is the question about how it's mounted on the machine, you can't guarantee that the centre hole is bang on centre especially if the wheels like my ones are reconditioned. Perhaps thats why I have problems. But if you think about it the centre hole is not how a wheel is attached to the car. Perhaps thats why Audi say centreless wheel balancing only.

[zollaf]

the centre hole mounts tightly over the hub and is how the wheel is mounted. the wheel bolts merely hold it on. this is why spigot rings must be used if the centre bore of the wheel is bigger than original. if you don't believe me, remove a factory fitted wheel and have a look. if the centre hole is off centre, then the wheel is scrap, not refurbed but scrap.

[warp_speed]

the centre hole mounts tightly over the hub and is how the wheel is mounted. the wheel bolts merely hold it on. this is why spigot rings must be used if the centre bore of the wheel is bigger than original. if you don't believe me, remove a factory fitted wheel and have a look. if the centre hole is off centre, then the wheel is scrap, not refurbed but scrap.

True, but if its cone mounted on a balancing machine you can't guarantee that the centre hole is bang on smooth and uniform across the inside circumference which is pressing up against the cone. Never ever had to take my wheels back when I've used a centreless balancing machine, had to many times on a centre mounted ones. :confused:

[zollaf]

i have balanced literally thousands of wheels over the years using a cone and never had a problem, including those fitted to many forms of vags. the only time the centreless adaptor gets used is for silly old citreons that have no centre hole.

[warp_speed]

i have balanced literally thousands of wheels over the years using a cone and never had a problem, including those fitted to many forms of vags. the only time the centreless adaptor gets used is for silly old citreons that have no centre hole.

You need to come up to Scotland with your calibrated machine and show them the way bud because I would be your customer no problem. ;)

[zollaf]

perhaps their machine is calibrated but they don't know how to use it. i have seen quite a few case where people don't set it up properly to start, put the weights 180 degrees from where they should be or just slightly out from where they should be (i.e. not quite right at the top) , or not fitting weights and the spinning up again to check, just fitting weights and removing the wheel. its like any machine, know how to use it and it will work well, not have a clue and become the most dangerous bloke in the street.

[discobarry]

i have balanced literally thousands of wheels over the years using a cone and never had a problem, including those fitted to many forms of vags. the only time the centreless adaptor gets used is for silly old citreons that have no centre hole.

Here here, I almost felt like I was being told that part of the job I do every day is me doing it wrong.